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This allows you to use RFC1051 with your ARCnet card via the virtual
arc0s device. You only need arc0s if you want to talk to ARCnet
software complying with the "old" standard, specifically, the DOS
arcnet.com packet driver, Amigas running AmiTCP, and some variants
of NetBSD. You do not need to say Y here to communicate with
industry-standard RFC1201 implementations, like the arcether.com
packet driver or most DOS/Windows ODI drivers. RFC1201 is included
automatically as the arc0 device. Please read the ARCnet
documentation in Documentation/networking/arcnet.txt for more
information about using arc0e and arc0s.